Finding the Fourth Proportional to 12,380.79, 18,580.37 and 7,707.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,380.79 : 18,580.37 = 7,707.59 : x
2. Step 2: Convert to fraction form
   12,380.79/18,580.37 = 7,707.59/x
3. Step 3: Cross multiply
   12,380.79x = 18,580.37 × 7,707.59
4. Step 4: Simplify right side
   12,380.79x = 143,209,874.01
5. Step 5: Solve for x
   x = 143,209,874.01/12,380.79
6. Step 6: Final answer
   x = 11,567.10